Unanswered: How to load multiple grids faster

I have 4 grid tables. They use the same modal. I cannot use the same store as each grid has to send a parameter value to get the data from db. So, what's happening is I ended up making 4 different stores and then when I load my application, it lags because it waits to load all the 4 stores. this is my grid.. so I have 3 more grids like this